Reciprocating pump



08% 8,1925- I I R. S. STRIEFLING RECIPROCATING PUMP- Filed Jan. 10. 1924 I INVENTOR. Pobrf J. five/113 2 and 3 enclose a concentrically disposed Patented Dec. 8, 1925.

UNITED STATES ROBERT S. STRIEFLING, OF DETROIT, MICHIGAN.

REoiPnooATINs PUMP.

' Application filed January 10, 1924. Serial No. 685,326.

To all whom it may concern.-

Be it known that I, ROBERT S. STRIEFLING, a citizen of the United States, and residing at Detroit, county of Wayne, and State of Michigan, have invented a new and Improved Reciprocating Pump, of which the following is a specification.

This invention relates to reciprocating pumps actuated by direct impulses from a cylinder of an internal combustion engine and has for its principal object to provide a pump having pockets to cushion the piston at either end of its stroke, and prevent its striking the cylinder heads.

Another object of the invention is to provide a device of the class described with pockets which will cushion the reciprocation of the piston without noise at the point of entering the pocket. 7

A further object of the invention is to incorporate an inlet to the pocket beneath the piston to provide an initial impulse whereby the piston is forced out of the pocket.

A still further object of the invention is to provide a device of the class described for pumping air to a predetermined pressure.

These and other objects will be apparent from the following description wherein reference is made to the accompanying drawings illustrating a preferred embodiment of my invention. 1

In the drawings Fig. 1' is a side elevation of the pump illustrating its application to the cylinder head of an internal combustion engine.

Fig. 2 is a longitudinal section of the pump.

Fig. 3 is a sectional detail showing a modification of the power inlet valve.

Similar numerals refer to similar parts throughout the several views.

The pump cylinder 1 and cylinder heads shaft 4 on which is slidably journaled a piston 5 adapted to reciprocate within the cylinder 1. g

The heads 2 and 3.are attached thru gaskets 66 to the cylinder 1 with cap screws 77 or other suitable fastenings, and the shaft 4 may be affixed by a set screw 8 and check nut 9 in the head 2.

An extension stem 10 from the head 3 is adapted to thread into a suitable port in the head of a cylinder of the gas engine as shown in broken lines in Fig. 1. The stem 10 may be providedwith a valve 11 for manually controlling the action of the pump, and when open, the valve 11 allows direct communication between the combustion chamber of the gas engine and a passage 12 extending thru the stem 10 into the adjacent end of the shaft 4.

An opening 13 to the passage 12 pierces the shaft %l at a predetermined distance from the head 3 to form a pocket in the adjacent end of the cylinder 1. An inlet port 14- to the said pocket is normally closed by the check valve 15, thru which pressure is admitted beneath the piston 5 when the latter covers the opening 13. A modification of this valve is illustrated in Fig. 3 in which the hollow check valve 16 is slidably journaled in the end of the shaft 4: and normally seated in the head 3 by a spring 17 'An inlet valve 18 and an outlet valve 19 are located below the head 2 of the cylinder 1, whereby the free air above the piston 5 in its lowermost position is compressed to a predetermined amount before the piston 5 passes the valves 18 and 19.

A suitable union 20 connects the outlet valve 19 with the compressed air line 21.

The pump cylinder 1 is webbed as at 22-22 to radiate heat. The piston 5 is grooved as 2323 to form oil rings or is otherwise sealed against leakage and may be flanged and cross drilled forthe insertion of lubricating packing 24 and 25.

In operation the piston 5 is driven up by compression and explosion in the gas engine passing first thru the check valve15 and after the piston rises beyond the opening 13 an additional passage for the impulse is uncovered.

The air above the piston is compressed by the rise of the piston and can escape only thru the outlet valve 19 into the line 21.

After the piston 5 passes the valves 18 and 19 no further escape for the air is provided and the increased compression balances the pressure from beneath before the piston stroke-in the gas engine, the compressed air above the piston 4 forces the latter down beyond the intake valve 18- and when the;

expansion of said air reduces its pressure below that of the outside air the valve 18 opens to allow air to enter the cylinder 1. But should the pressure in the line 21 be high enough to increase the pressure above the piston to a point where its re-expansion would not reduce it below atmospheric pressure, no air will be admitted thru the inlet 5 valve 18 and continued operation of the pump will not increase the pressure in the line 21.

During the intake stroke of the gas engine the pressure below the piston 4 is relieved thru the opening 13, until the piston & covers said opening 13 as shown in section in Figs. 2 and 3 and the increasing pressure, retained by the check valve 15, stops the piston before it reaches the head 3.

Thus at all times the piston 5 is suspended betweenthe heads 2 and 3 not touching at either end of its stroke, being guided when passing all ports and openings and thru its entire act-ion.

From the foregoing it becomes evident that the device is very simple and efiicient, operates automatically, will not easily get out of order and provides a device which accomplishes the objects described.

While it will be apparent that the illustrated embodiment of my invention herein disclosed is well calculated to adequately fulfill the objects and advantages primarily a piston adapted, to reciprocate on said shaft and within the cylinder, a duct connecting to a gas engine and extending longitudinally into one end of the shaft, a valve from said duct to the adjacent end of the cylinder, an opening to the duct thru'the shaft, inlet and outlet valves spaced from the opposite end, whereby the reciprocations of the piston are prevented from extending to the ends of the cylinder. 2. In a reciprocating'pump, a cylinder, a shaft extending longitudinally within said cylinder having a passage through one end thereof, and having a port opening from said passage to the cylinder, a piston reciprocating upon said shaft and controlling said port and means for delivering an actuating fluid for said piston to said passage.

In witness whereof I hereto set my hand.

ROBERT S. STRIEFLING. 

